/*
 * Copyright 2012-2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.boot.redis;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Assume;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
/**
 * {@link TestRule} for working with an optional Redis server.
 *
 * @author Eric Bottard
 * @author Gary Russell
 * @author Dave Syer
 * @author Phillip Webb
 */
public class RedisTestServer implements TestRule {
    private static final Log logger = LogFactory.getLog(RedisTestServer.class);
    private JedisConnectionFactory connectionFactory;
    @Override
    public Statement apply(final Statement base, Description description) {
        try {
            this.connectionFactory = createConnectionFactory();
            return new RedisStatement(base, this.connectionFactory);
        }
        catch (Exception ex) {
            logger.error("No Redis server available", ex);
            return new SkipStatement();
        }
    }
    private JedisConnectionFactory createConnectionFactory() {
        JedisConnectionFactory connectionFactory = new JedisConnectionFactory();
        connectionFactory.afterPropertiesSet();
        testConnection(connectionFactory);
        return connectionFactory;
    }
    private void testConnection(JedisConnectionFactory connectionFactory) {
        connectionFactory.getConnection().close();
    }
    /**
     * @return the connection factory if any
     */
    public RedisConnectionFactory getConnectionFactory() {
        return this.connectionFactory;
    }
    private static class RedisStatement extends Statement {
        private final Statement base;
        private final JedisConnectionFactory connectionFactory;
        RedisStatement(Statement base, JedisConnectionFactory connectionFactory) {
            this.base = base;
            this.connectionFactory = connectionFactory;
        }
        @Override
        public void evaluate() throws Throwable {
            try {
                this.base.evaluate();
            }
            finally {
                try {
                    this.connectionFactory.destroy();
                }
                catch (Exception ex) {
                    logger.warn("Exception while trying to cleanup redis resource", ex);
                }
            }
        }
    }
    private static class SkipStatement extends Statement {
        @Override
        public void evaluate() throws Throwable {
            Assume.assumeTrue("Skipping test due to " + "Redis ConnectionFactory"
                + " not being available", false);
        }
    }
}
